Perhaps you should try some spelling variations:
"fop perov OR petriv OR petru OR petri OR peteri OR peteri OR petr o.s.*" » "fop petrov OR petriv OR petru OR petri OR peteri OR peteri OR petr o.s.*" (Expand Search), "fop perov OR peteriv OR peteru OR peteri OR peteri OR peteri OR peter o.s.*" (Expand Search), "fop perov OR petroiv OR petrou OR petroi OR peteri OR peteri OR petro o.s.*" (Expand Search), "fop perov OR periv OR peru OR peri OR peteri OR peteri OR per o.s.*" (Expand Search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: fop ((perov OR petriv) OR ((petru OR ((petri OR peteri) OR peteri)) OR petr)) o.s.*.